Core Java Interview Questions
Questions Answers Views Company eMail

my method "abc" return array of interface "xyz" and "pqr" is abstract class implements abc and class "jkl" extends pqr My problem 1) when i call abc it retrun array xyz how can i do this hint xyz refer_xyz = new jkl(); but i can't create array. 2)I want to access method of jkl using reference of xyz??

1 3508

why interaction with server using javascript is difficult

1 3463

StringBuilder s = new StringBuilder("Hello Mom");s.append(",I mean,Mother"); Response.Write(s.ToString()); String s = "Hello Mom"; s+ = ",I mean Mom"; Response.Write(s); Which is faster ? which uses the most memory?

HCL,

6 8043

I have one Shopping cart application, i that i have selected some items, while clicking submit button by mistake i have clicked twice or trice, that time items are selected twice or trice. Actually i want only one copy of items but its selected twice or trice. So how can we avoid this problem?

Honeywell,

2 6348

How Vector class is synchronized,How to build user defined class as synchronized?

1747

What is difference between abstract class & final class

7 25903

Hai all I want to print given array in reverse order Ex: int a[]={1,2,3,4,5};display this array in reverse order.

4 5468

what is the output ? Math.floor(-2.1) a)2 b)-2 c)-3.0 d)0

Accenture,

4 13155

How to find the size of an array a)array.length() b)array.length c)array.size() d)array.size

Accenture,

6 10046

what is the Yield() method used in threads?

Accenture,

4 7691

System.out.println(101/14) what is the output? a)6 b)14 c)7.14 d)0

Accenture,

8 9642

when a servlet sends request for first time it uses the follwing methods a)init b)doget() c)dopost() d)service

Accenture,

4 6840

What is Hash Code in Java?

Cognizant,

6 14873

What are uses of Hash Code?

Cognizant,

2 6874

I have 100 records in a table with two rows. I need to display 10 records per page like Google Search. I need only the Logic(Pagination) in Pure Java. No JSP and all..Thanks in Advance...

Cybernet,

2 7603


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Un-Answered Questions { Core Java }

What is difference between array and arraylist in java?

736


How do you escape in java?

824


How many inner classes can a class have?

830


What is the unit of plancks constant?

806


How many bits is a string in java?

802


What is the difference between method overriding and overloading?

853


Garbage collection in java?

799


Can a variable be local and static at the same time?

790


What is bubble sorting in java?

836


What are the three types of design patterns?

751


What is the final class modifier?

785


What about main thread in java?

885


What happens to the Exception object after handling an exception?

2105


Is java se free?

728


Explain about class in java?

872